The "fighters" rammed by the bus on the Luftwaffe airfield towards the end of the film are NA Harvards. The Ju-52 used was an actual Junkers built example that had been borrowed from the Swiss Air Force for filming : http://www.airliners.net/open.file/0718298/L/ A picture of it from later still wearing the same camoflage.

The "fighters" rammed by the bus on the Luftwaffe airfield towards the end of the film are NA Harvards. The Ju-52 used was an actual Junkers built example that had been borrowed from the Swiss Air Force for filming : http://www.airliners.net/open.file/0718298/L/ A picture of it from later still wearing the same camoflage.

(2012 UPDATE)....The fighter planes are actually North american T-6, made by Noorduyn in Canada, the ones you see on screen are from a batch of 40 scrapped by the Swiss Air Force in 1969...originally they were delivered to the RAF in Canada in 1942 and then in 1946 they were all refitted in Holland after being surplussed then they were sold to the Swiss in 1949, they were last used by the Swiss in Jan 1969 when they were scrapped and replaced by the Pilatus P-3.
Out of the original Swiss compliment of 40 aircraft, only 3 remain in preservation..all in Germany..the rest being scrapped (some of the then already withdrawn and scrapped planes are what appear in this movie mocked up as FW 190s).

I question the ID of the bus -- As far as I can see it is a Mack. A model similar to the 43SB, which were primarily sold as school buses in America. A similar model for public transportation was marketed internationally. These buses were sold in the late '30's to early 40's. If nothing else, notice the Mack bulldog hood ornament.